Three years after release, Left 4 Dead 2 is a massive game containing 13 Official Campaigns, 8 Game Modes and countless user created Campaigns and Mutations. It s a lot to soak in over just one weekend so here is a breakdown of what s included.

The original Left 4 Dead 2 campaigns take the four survivors, Coach, Nick, Ellis, and Rochelle from Savannah to possible safety in New Orleans. These campaigns are: Dead Center, Dark Carnival, Swamp Fever, Hard Rain, and The Parish. The Passing is an additional campaign fitting between Dead Center and Dark Carnival that introduces the L4D2 survivors to the gang from L4D1. Cold Stream is a non-cannon community campaign released as an official campaign.

Left 4 Dead 2 is now free to play this entire weekend. If you are new to the Left 4 Dead world, we have a list of tips below. If you have been around for a bit, don’t forget we have the Good Guy Nick achievement for you to earn starting today.

Additionally, to help find players and start games or just talk about Left 4 Dead 2, join us in the Official Game Groupchat this Saturday. Devs will be hanging out in chat and in games from 10am to 6pm PST this Saturday.

To celebrate Halloween, we are unleashing L4D2 on the world. Starting this Thursday, the entire game will be free to play for the whole weekend. New players can begin pre-loading now. For long time players, it is time to welcome your new found friends and help them survive the zombie apocalypse.

The Left 4 Dead community has created a wealth of movies. They range from a simple collection of Nick’s profanity, to animated shorts, to full feature films.

Previously we would have to hunt around on Youtube to find all the movies but now with the new Steam Game Hubs, we can find all the movies in one place. To help us have all the movies in one place – if you created a movie for the L4D world - add it to the L4D2 Game Hub (We don’t have a way to attach the movies to a franchise so we are using L4D2 which incorporates both games). To do that, click on the "Videos" link on your profile page and associate your Youtube account with your Steam Id and then select the L4D themed movies from your channel and attach them to the L4D2 channel.

With today’s update and Steam’s Beta update we should have all of the “error 55” issues resolved. If you are in the Steam Beta program, make sure to accept the update to the beta today as that was causing a conflict.

When we had the issue with "Remove plug-ins” many players added “-insecure” to their command line. After we resolved the issue, if you still had “-insecure” in your command line it would continue to give you the "Remove plug-ins” error. We have updated this error text to give you the correct information. If you get an error that you are trying to connect to a secure server in an insecure manner remove –insecure from your command line launch options.

The Steam Workshop website will allow you to browse, rate, and discuss thousands of community created add-ons and even install them directly to your game with just one click of the mouse. We are also going to try an experiment with the L4D2 Workshop that will allow content to appear in the L4D2 world even more seamlessly based on the community’s response.

Today, Team Fortress 2 is adding co-op and robots to their game! There is only one problem - don’t worry, robots are just the zombies of the future that’s not the problem – the problem is this is 6 player co-op not 4. So you’re gonna need to find a few new friends, a younger brother, your mom, someone, anyone to join you and your three friend to fight the lethal horde of robots.